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4.6.7 Motor Checkout Procedure (285 Ipm)
Note:
Perform the following procedures when
checking either the type belt motor or the
carriage motor. A chart is shown for each motor.
The resistance values are nominal values and
might vary because of the ohmmeter. A com-
parison between the components in the circuit
being checked is the best indication of a defec-
tive component.
1.
Turn power off and remove the printer
covers.
2.
Open the printer card gate and lock it in
the open position. Remove the card gate
cover.
3.
Remove the driver card A23B (see 4.5.5).
4.
Set the ohmmeter to the X 1 scale.
5.
Disconnect the plug from the motor to
be checked. Measure the resistance be-
tween the plug pins as shown in the charts
on this page.
6.
Check continuity of phase lines from
driver card to motor plugs.
7.
See the following list of removals and
replacements and replace any defective
component.
Type belt motor removal and replacement
(4.6.15).
Carriage motor removal and replacement
(4.6.40).
Motor resistor removal and replacement
(4.6.9).
Motor phase capacitor removal and replace-
ment (4.6.8).
Type Belt Motor (285 Ipm)
Motor End
Plug Pins
5 and 1
5 and 2
6 and 3
6 and 4
Cable End
Plug Pins
7 and 5
8 and 6
1 and 2
3 and 4
Phase
Checked
A
(Not) A
B
(Not) B
ACom
B Com
Resistance
Values
Component
Description
1.2 ohms
A phase motor coil
1.2 ohms
1.2 ohms
1.2 ohms
Resistance
Values
4 ohms R2
4 ohms R3
C3
1
C3
1
Plug
No.
Driver
P7-1
A23C42
P7-2
A23C49
P7-3
A23C44
Not A phase motor coil
B phase motor coil
Not B phase motor coil
Component
Description
A-phase common
resistor
B-phase common
resistor
A-phase capacitor
B-phase capacitor
P7-4
A23C45
P7-7
A23C62
P7-8
A23C64
1
Set ohmmeter to 1 K scale. The ohmmeter needle
must go toward zero and back to infinity. Failure
to do so indicates a defective capacitor.
Belt Printer
2851pm
4-103
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